<unfollowing intensifies>
@St_Rev I read that creepy placenta-like things have evolved in diverse taxa of fish that normally don't have them
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@sarahdoingthing The placental arms race seems to be extra-horrific in humans, dunno why. -
@St_Rev complicated mating structures? high paternal investment with social monogamy + cheating - 4 more replies
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@sarahdoingthing Was reading the other day that marmosets give birth to chimeric twins basically 100% of the time, via blood cell exchange. - End of conversation
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